Journal of Research of the National Bureau of Standards

Topics: Analytical functions, approximation, Gaussian quadrature, integration, optimal quadrature,...

218
218

Jun 12, 2011
06/11

by
Simburger, Edward J.; Scarborough, Stephen E., et al; Matsumoto, James H.; Giants, Thomas W.; Garcia, Alexander, III; Liu, Simon; Rawal, Suraj P.; Perry, Alan R.; Marshall, Craig; Lin, John K.

texts

######
eye 218

######
favorite 0

######
comment 0

Dual junction amorphous silicon (a-Si) solar cells produced on polyimide substrate have been selected as the best candidate to produce a lightweight solar array for the PowerSphere program. The PowerSphere concept features a space-inflatable, geodetic solar array approximately 0.6 meters in diameter and capable of generating about 20W of electrical power. Trade studies of various wiring concepts and connection methods led to an interconnect design with a copper contact that wraps around the...

Topics: DISTORTION, SIGNAL DETECTION, TIME DEPENDENCE, SATELLITE COMMUNICATION, SIMULATION, TRAVELING WAVE...

R&D Report 1971-30 : An experimental quadrature modulation system for video signals R.N. Robinson An experimental two-channel quadrature modulation system operating at VHF has been developed. This is used to illustrate the performance that may be expected of a practical system for transmission of wide-band signals in the UHF or SHF bands. This method of modulation enables two signals to be transmitted at the same carrier frequency. Two carriers of identical frequency, but displaced in phase...

Topics: phase, signal, frequency, loop, modulation, crosstalk, carrier, oscillator, signals, quadrature,...

30
30

web

######
eye 30

######
favorite 0

######
comment 1

La Quadrature du Net dumped with WikiTeam tools.

( 1 reviews )

Topics: wiki, wikiteam, MediaWiki, La Quadrature du Net, laquadraturenet_wiki

A system design for aeronautical audio broadcasting, with C-band uplink and L-band downlink, via Inmarsat space segments is presented. Near-transparent-quality compression of 5-kHz bandwidth audio at 20.5 kbit/s is achieved based on a hybrid technique employing linear predictive modeling and transform-domain residual quantization. Concatenated Reed-Solomon/convolutional codes with quadrature phase shift keying are selected for bandwidth and power efficiency. RF bandwidth at 25 kHz per channel,...

Topics: NASA Technical Reports Server (NTRS), AUDIO DATA, BROADCASTING, FREQUENCY DIVISION MULTIPLE ACCESS,...

The development of a transmultiplexor and a quadrature phase shift keying (QPSK) demodulator is discussed. The system is designed to meet real time signal processing requirements of future satellite systems and should consume very little power. The architectures of the transmultiplexor and the demodulator are designed for the pipelining of all the modules, namely the commutator, the filter bank fast fourier transform (FFT), and the internal modules of the QPSK. The architecture is designed for...

Topics: NASA Technical Reports Server (NTRS), DEMODULATORS, FREQUENCY DIVISION MULTIPLE ACCESS, HARDWARE,...

A bandwidth-efficient constant-envelope Proof-of-Concept (POC) modem is described. The modem was developed on an Advanced Modulation Techniques Development contract for the NASA/Lewis Research Center. The POC modem employs 16-ary Continuous Phase Frequency Shift Keying (16-CPFSK) modulation. The 16 frequencies are spaced every 1/16th baud rate which produces a compact spectrum allowing 2 bits/sec/Hz operation. The modem is designed for 200 mb/s Time Division Multiple Access (TDMA) application...

Topics: NASA Technical Reports Server (NTRS), DECODING, DOWNLINKING, FREQUENCY SHIFT KEYING, MODEMS, PHASE...

The need for a Programmable Rate Digital Satellite Modem capable of supporting both burst and continuous transmission modes with either Binary Phase Shift Keying (BPSK) or Quadrature Phase Shift Keying (QPSK) modulation is discussed. The preferred implementation technique is an all digital one which utilizes as much digital signal processing (DSP) as possible. The design trade-offs in each portion of the modulator and demodulator subsystem are outlined.

Topics: NASA Technical Reports Server (NTRS), BINARY PHASE SHIFT KEYING, DEMODULATORS, DIGITAL TECHNIQUES,...

The commercial impact and technical success of Trellis Coded Modulation seems to illustrate that, if Shannon's capacity is going to be neared, the modulation and coding of an analogue signal ought to be viewed as an integrated process. More recent work has focused on going beyond the gains obtained for Average White Gaussian Noise and has tried to combine the coding/modulation with adaptive equalization. The motive is to gain similar advances on less perfect or idealized channels.

Topics: NASA Technical Reports Server (NTRS), ANALOG DATA, DATA TRANSMISSION, DECISION THEORY, INFORMATION...

An analytical method and a stored channel model were used to evaluate error performance of uncoded quadrature phase shift keying (QPSK) and M-ary phase shift keying (MPSK) trellis coded modulation (TCM) over shadowed satellite mobile channels in the presence of phase jitter for various carrier recovery techniques.

Topics: NASA Technical Reports Server (NTRS), CHANNELS (DATA TRANSMISSION), MOBILE COMMUNICATION SYSTEMS,...

Techometers Solvere Brochure

Topics: rpm, impedance, voltage, excitation, axis, phase, error, output, quadrature, tachometers

An increasing number of flight research and airborne science experiments now contain network-ready systems that could benefit from a high-rate bidirectional air-to-ground network link. A prototype system, the High-Rate Wireless Airborne Network Demonstration, was developed from commercial off-the-shelf components while leveraging the existing telemetry infrastructure on the Western Aeronautical Test Range. This approach resulted in a cost-effective, long-range, line-of-sight network link over...

Topics: NASA Technical Reports Server (NTRS), FLIGHT TESTS, WIRELESS COMMUNICATION, COMMUNICATION NETWORKS,...

Method and apparatus for estimating signal-to-noise ratio (SNR) gamma of a composite input signal e(t) on a phase modulated (e.g., BPSK) communications link. A first demodulator receives the composite input signal and a stable carrier signal and outputs an in-phase output signal; a second demodulator receives the composite input signal and a phase-shifted version of the carrier signal and outputs a quadrature-phase output signal; and phase error theta(sub E)(t) contained within the composite...

Topics: NASA Technical Reports Server (NTRS), BINARY PHASE SHIFT KEYING, COMMUNICATION NETWORKS, PHASE...

A document discusses a multi-Gigabit-per-second, Ka-band transceiver with a software-defined modem (SDM) capable of digitally encoding/decoding data and compensating for linear and nonlinear distortions in the end-to-end system, including the traveling-wave tube amplifier (TWTA). This innovation can increase data rates of space-to-ground communication links, and has potential application to NASA s future spacebased Earth observation system. The SDM incorporates an extended version of the...

Topics: NASA Technical Reports Server (NTRS), BIT ERROR RATE, COMMUNICATION NETWORKS, DECODERS, END-TO-END...

The OH-stretching fundamental, and the first, second, and third OH overtone vibrations have been examined using pure and GeO2 - doped graded index, fused silica optical fibers having OH contents from less than 1ppm to greater than 1,000 ppm. The previously reported component substructure of the fundamental vibrations of fused silica. Several new vibrations were uncovered and assigned. Examinations of deuterated OH samples helped to verify the assignments. The spectral broadening produced by...

Topics: DTIC Archive, Stone,J, HOWARD UNIV WASHINGTON D C DEPT OF CHEMISTRY, *MOLECULAR VIBRATION, *FUSED...

An innovative method for measuring the particle size and velocity, simultaneously using the Doppler difference frequency and the phase shift of the scattered light was derived, analyzed, and evaluated experimentally. Initially, the theoretical analysis of the dual beam laser light scattering phenomena were performed using simple geometrical optics theory. This approach allowed ready insight of the complex scattering phenomena associated with the method. In particular, the difficulties that may...

Topics: DTIC Archive, Bachalo,William D, AEROMETRICS INC MOUNTAIN VIEW CA, *LIGHT SCATTERING, *PARTICLE...

This thesis is a continuation of the design and development of a three-dimensional 2.4 GHz digital phased array radar antenna. A commercial off-the-shelf quadrature modulator and demodulator were used as phase shifters in the digital transmit and receive arrays. The phase response characteristic of the demodulator was measured and the results show that the phase difference between the received phase and transmit phase is small. In order to increase the bandwidth of the phased array, a method of...

Topics: Phased array antennas, Antenna arrays, Antennas (Electronics), Radar, Phased array, Antenna,...

R&D Report 1975-19 : Stereophonic reception using the pilot-tone system: compatibility of current receivers when quadrature subcarrier modulation is added D.J. Whythe This Report describes the results of measurements made on ten current stereo receivers to determine the effect on stereo reception when a pair of sidebands are added in quadrature to those of the existing difference signal, centred on 38 kHz. The measurements were mainly objective but the results of a brief listening test are...

Topics: quadrature, sidebands, modulation, receiver, stereo, harmonic, khz, subcarrier, sin, regenerated,...

Classical (separate) and joint detection and estimation procedures are extended to the case of complex multidimensional data. Initial results for complex multivariate Gaussian processes indicate that the detector structure involves determinants of sample covariance matrices--a mixture of conventional power and correlation detectors.

Topics: DTIC Archive, Miller, Leonard E, LEE (J S) ASSOCIATES INC ARLINGTON VA, *ADAPTIVE SYSTEMS,...

The OH-stretching fundamental, and the first, second, and third OH overtone vibrations have been examined using pure and GeO2 - doped graded index, fused silica optical fibers having OH contents from less than 1ppm to greater than 1,000 ppm. The previously reported component substructure of the fundamental vibrations of fused silica. Several new vibrations were uncovered and assigned. Examinations of deuterated OH samples helped to verify the assignments. The spectral broadening produced by...

Topics: DTIC Archive, Stone,J, HOWARD UNIV WASHINGTON D C DEPT OF CHEMISTRY, *MOLECULAR VIBRATION, *FUSED...

The OH-stretching fundamental, and the first, second, and third OH overtone vibrations have been examined using pure and GeO2 - doped graded index, fused silica optical fibers having OH contents from less than 1ppm to greater than 1,000 ppm. The previously reported component substructure of the fundamental vibrations of fused silica. Several new vibrations were uncovered and assigned. Examinations of deuterated OH samples helped to verify the assignments. The spectral broadening produced by...

Topics: DTIC Archive, Stone,J, HOWARD UNIV WASHINGTON D C DEPT OF CHEMISTRY, *MOLECULAR VIBRATION, *FUSED...

A new 'discrete elements' (LN) transport method is derived and compared to the discrete ordinates SN method, theoretically and by numerical experimentation. The discrete elements method is more accurate than discrete ordinates and strongly ameliorates ray effects for the practical problems studied. The discrete elements method is shown to be more cost effective in terms of execution time with comparable storage to attain the same accuracy, for a one-dimensional test case using linear...

Topics: DTIC Archive, Mathews, Kirk A., AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF...

Solvere Motor Techometers Flyer

Topics: rpm, impedance, voltage, solvere, excitation, axis, phase, error, output, quadrature

A new version of the Fast Multipole Method (FMM) for potential fields is presented. While the old FMM uses multipole expansions to represent potentials, we use specially designed basis functions, displaying much faster convergence. Furthermore, we introduce an intermediate representation, in which most translation operators are diagonal. As a result, in two dimensions we obtain an improvement of a factor of three to five in speed, compared to previously published algorithms; the improvement is...

Topics: DTIC Archive, Hrycak, Tomasz, YALE UNIV NEW HAVEN CT DEPT OF COMPUTER SCIENCE, *ALGORITHMS,...

Low Probability of Intercept (LPI) radars are a class of radar systems that possess certain performance characteristics causing them to be nearly undetectable by most modern digital intercept receivers. Consequently, LPI radar systems can oper-ate undetected until the intercept receiver is much closer than the radar.s target detector. The enemy is thus faced with a sig-nificant problem. To detect these types of radar, new direct digital receivers that use sophisticated signal processing are...

Topics: Signal processing, Digital filters (Mathematics), Digital filters, LPI, LPI radar signals,...

Westinghouse Electric Corporation Division under NASA contract NAS3-25865 developed a proof-of-concept (POC) multichannel demultiplexer implemented as an acousto-optic radiofrequency (RF) with a spectrum analyzer. A detailed analysis of the experimental results indicate that the expected degradation caused by the acousto-optical channelizer is approximately 2.0 dB degradation at 10(exp -5) bit-error rate (BER) and 3.0 dB degradation at 10(exp -8) BER. This degradation may be quite acceptable...

Topics: NASA Technical Reports Server (NTRS), ACOUSTO-OPTICS, DEGRADATION, RADIO FREQUENCIES, MULTIPLEXING,...

Union bounds and Monte Carlo simulation Bit-Error-Rate (BER) performance results are presented for various 32-ary and 64-ary Quadrature Amplitude Modulation (QAM) schemes. Filtered and unfiltered modulation formats are compared for the best packing arrangement in peak power limited systems. It is verified that circular constellations which populate as many symbols as possible at the peak magnitude offer the best performance. For example: a 32-ary QAM scheme based on concentric circles offers...

Topics: NASA Technical Reports Server (NTRS), BIT ERROR RATE, COMMUNICATION NETWORKS, MONTE CARLO METHOD,...

Maximally decimated filter banks have been extensively studied in the past. A filter bank is said to be under-decimated if the number of channels is more than the decimation ratio in the subbands. A maximally decimated filter bank is well known for its application in subband coding. Another application of maximally decimated filter banks is in block filtering. Convolution through block filtering has the advantages that parallelism is increased and data are processed at a lower rate. However,...

Topics: NASA Technical Reports Server (NTRS), DESIGN ANALYSIS, DIGITAL FILTERS, ERROR DETECTION CODES,...

In this work, we explore the feasibility of injecting data into an existing radar waveform. Specifically, we investigate how to embed communications signals within a navigation radar pulse to explore the potentials for a) receiving and demodulating the associated communications data, and b) identifying potential vulnerabilities/effects to maritime networks that inadvertently receive data in this manner. In this thesis, we advance previous work by utilizing a more practical, navigation-like...

Topics: communications, radar, FURUNO, cyber, injection, maritime, QPSK, QAM, modulation, demodulation,...

A comprehensive study of multiresolution signal processing techniques is conducted. Background material in functional analysis and Quadrature Mirror Filter (QMF) banks is presented. The development of Mallat's algorithm for multiresolution decomposition and reconstruction is outlined and demonstrated to be equivalent to QMF banks. The Laplacian pyramid and the a trous algorithm are described and demonstrated. General multiresolution structures are constructed from cascades of QMF and pseudo-QMF...

Topics: Functional Analysis, Quadrature Mirror Filter (QMF) banks, Multiresolution Analysis, Wavelet...

There are many possible strategies for sampling the near forward scattering pattern produced by a field of large particles and for subsequently solving the inverse problem in order to obtain an estimate of the particle size distribution. In a previous paper an optimally scaled formulation of the problem was derived based on consideration of condition numbers of the linear system obtained through numerical quadrature of the governing Fredholm integral equation. Here we consider scaling of the...

Topics: DTIC Archive, Hirleman, E D, ARIZONA STATE UNIV TEMPE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING,...

The modern aerospace controls engineer is provided with a variety of powerful tools to aid in the design and testing of digital flight control systems. The current fiscal environment requires extensive validation of all aerospace based systems through simulation and hardware-in-the-loop testing prior to implementation. This work explores the design and evaluation of an Automatic Flight Control System (AFCS) for the Bluebird Unmanned Aerial Vehicle (UAV). Software tools such as MATLAB and...

Topics: DTIC Archive, Foley, Brian T., NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *DIGITAL SYSTEMS, *SYSTEMS...

During the grant period, we developed a major improvement in the calculation of the Coulomb term appearing in ab initio electronic structure methods based on Gaussian orbitals. Our efficient implementation of the Gaussian very Fast Multipole Method (GvFMM) combines speed, accuracy, and linear scaling properties. The method is clearly superior to state-or-the-art analytic integration techniques of Gaussian functions. Our benchmarks on graphitic sheets containing more than 400 atoms and 3,500...

Topics: DTIC Archive, Scuseria, Gustavo E., RICE UNIV HOUSTON TX DEPT OF CHEMISTRY, *METALS, *QUANTUM...

Analysis shows that the initial curvature of the distribution curve is always smaller for a polydisperse system than for a monodisperse system than for a monodisperse system. From this information and a knowledge of the position of the asymptote, it appears that the curve for a polydisperse case lies below the curve for a monodisperse case. The asymptotic behavior of the angular distribution function is shown to be unmodified by branching. These and other considerations indicate that the...

Topics: DTIC Archive, BENOIT, H., HARVARD UNIV CAMBRIDGE MA GIBBS CHEMICAL LAB, *LIGHT SCATTERING,...

This section reviews the graph-theoretic elimination model of Gaussian elimination and introduces a new element model.

Topics: DTIC Archive, Eisenstat,S C, Schultz,M H, Sherman,A H, YALE UNIV NEW HAVEN CONN DEPT OF COMPUTER...

For progressive censoring schemes pertaining to a general class of (parametric as well as nonparametric) testing situations, one encounters a (partial) sequence of linear combinations of functions of order statistics where the coefficients are themselves stochastic variables. Weak convergence of such a quantile process to an appropriate Gaussian function is studied here, and the same is incorporated in the formulation of suitable (time -) sequential tests based on these quantile processes....

Topics: DTIC Archive, Sen,Pranab Kumar, NORTH CAROLINA UNIV AT CHAPEL HILL DEPT OF STATISTICS, *STOCHASTIC...

It is shown that by the use of Information Theory, any metrizable topology may be metrized as an orthogonal Euclidean space (with a random Gaussian probability distribution) times a denumerable random cartesian product of irreducible (wrt direct product) denumerable groups. The necessary algorithm to accomplish this metrization from a statistical basis is presented. If such a basis is unavailable, a certain nilpotent projection operator has to be used instead, as is shown in detail in the...

Topics: DTIC Archive, Scibor-Marchocki,Romuald I, NORTHROP NORTRONICS ANAHEIM CALIF SYSTEMS SUPPORT DEPT,...

This paper deals with the parameters estimation of discrete-time and time-invariant system, affected by additive output noise, under periodic operation. Assuming a norm of the Fisher Information Matrix as performance index, the problems of the optimal periodic input design, of the joint optimal periodic input and measurement schedules design and of the choice of the best period for parameters estimation are formally stated. Through the introduction of the average per sample Fisher Information...

Topics: DTIC Archive, Scida,Sergio Bittanti, HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED...

A comparison is made of the merits of three popular algorithms for direct solutions of large, sparse matrices: Gaussian Elimination, LU Decomposition, and Gauss-Jordan Reduction. A mathematical theory discussion explains the algorithms and predicts their performance for arbitrary and strongly structured matrices. Particular emphasis is placed on solution accuracy and the efficient use of core space. The same test problems are used to analyze the Gaussian Elimination algorithm programmed by this...

Topics: DTIC Archive, Poore, Michael F., AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF...

A numerical method is developed to compute the pressure distribution and normal approach in a generalized elliptical contact between layered linearly elastic solids. The computed quantities are obtained as an approximate solution to an integral equation formulated for the most general case of Hertz's assumptions, i.e., the frictionless contact between arbitrary surfaces whose undeformed normal separation can be approximated by the separation between an elliptical paraboloid and the tangent...

Topics: DTIC Archive, McCormick,John A, MECHANICAL TECHNOLOGY INC LATHAM N Y, *ELASTOMERS, *NUMERICAL...

Recent results in information theory promise the existence of tree and trellis data compression systems operating near the Shannon theoretical bound, but provide little indication of how actually to design such systems. Presented here are several intuitive design approaches and also a general design philosophy based upon the generation of fake processes i.e., finite entropy processes which are close (in the generalized Ornstein distance) to the process one wishes to compress. Most of the design...

Topics: DTIC Archive, Linde, Joseph, STANFORD UNIV CA STANFORD ELECTRONICS LABS, *DECISION THEORY, *DATA...

Gaussian kernel regularization is widely used in the machine learning literature and proven successful in many empirical experiments. The periodic version of the Gaussian kernel regularization has been shown to be minimax rate optimal in estimating functions in any finite order Sobolev spaces. However, for a data set with n points, the computation complexity of the Gaussian kernel regularization method is of order On3. In this paper we propose to use binning to reduce the computation of...

Topics: DTIC Archive, Shi, Tao, CALIFORNIA UNIV BERKELEY DEPT OF STATISTICS, *LEARNING MACHINES, *GAUSSIAN...

This work was undertaken to develop a capability to predict photoemission from materials for soft x-ray sources. Soft x-rays have energies of a few keV or less. The Boltzmann equation was solved for the electron flux - from this flux, other quantities of interest may be obtained, e.g., the photoemission yields. Three materials have been examined: aluminum, aluminum oxide, and silicon dioxide. Back photoemission yields are presented in this report for these materials. For aluminum, an extensive...

Topics: DTIC Archive, Strickland, D J, *PHOTOELECTRIC EMISSION, *SOFT X RAYS, *X RAY ABSORPTION ANALYSIS,...

Naval Postgraduate School

2
2.0

Feb 2, 2021
02/21

by
Frostenson, Nels A.; Sonnefeld, Michael D.

texts

######
eye 2

######
favorite 0

######
comment 0

This research considers a particular form of M-ary signaling called 2 FSK/QPSK. It is a unique way of combining two modulation methods to produced an 8-ary signaling technique whose noise performance is shown to be significantly better than 8-PSK. A transmitter and receiver for 2 FSK/QPSK is designed, built, tested and analyzed. Theoretical and experimental results are compared using a plot of probability of bit error versus signal-to-noise ratio (SNR). Known theoretical performance of 8-PSK is...

Topics: Electrical and computer engineering, quadrature phase shift keying (QPSK), frequency shift keying...

This report presents results on characterizations of multivariable control systems. The major results are: extension of the asymptotic modal approach of selecting quadratic performance indexes to the discrete case; the lack of guaranteed stability margins for linear quadratic Gaussian systems, and a design procedure to improve the stability margins for such systems; characterization of multivariable loop transmission properties in terms of singular values and singular vectors, which provides a...

Topics: DTIC Archive, Harvey ,C A, HONEYWELL SYSTEMS AND RESEARCH CENTER MINNEAPOLIS MN, *CONTROL SYSTEMS,...

The regions of convergence and divergence of two series representations for associated Legendre functions of the first and second kind degree nu and order mu, are investigated. The series are shown to be absolutely convergent when the real part of the complex order mu is less than zero, conditionally convergent when the real part of mu is greater than or equal to zero and less than one-half, and divergent when the real part of mu is greater than or equal to one-half. Numerical calculations for...

Topics: DTIC Archive, Walbert,James N, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *ASYMPTOTIC...

This report describes a study in which several aspects of the discrete time Neyman-Pearson detector are investigated using experimental acoustic data. The problem considered is that of detecting a known signal from an active sonar operating a reverberant environment. The noise background consists of sonar returns obtained by directing a transmitter and receiver toward the wind driven surface of a freshwater lake. Data for the known signal consist of echoes from a styrofoam sphere. Both signal...

Topics: DTIC Archive, Estes,Arthur J, TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS, *SONAR SOUND ANALYZERS,...

Contents: Analysis of Tank Fire Control Systems by Optimal Control Theory; General Structure Discrete-Time Observers; On the Design of Predictors for Fire Control Systems; Microprocessor Implementation of an Adaptive Second Order Tracking/Prediction Algorithm for Tank Fire Control; On the Credibility of Models; A Linear Nonlinear Control Problem; Application of Modern Estimation and Control Techniques to the Glaads Test Vehicle; On Designing Robust Predictors Using Finite State Markov Chains;...

Topics: DTIC Archive, Cohen, Herbert E., ARMY MATERIEL SYSTEMS ANALYSIS ACTIVITYABERDEEN PROVING GROUND MD,...

The inverse Gaussian or the first passage time probability distribution for Brownian motion with a drift is particularly important for modeling and interpreting observed distributions of time intervals in many different fields of research. In this paper we deal with the problem of selecting a subset of k inverse Gaussian populations which includes the 'best' population, i.e. the (unknown) population which is associated with the largest value of the unknown means. The shape parameters of the...

Topics: DTIC Archive, Gupta,Shanti S, PURDUE UNIV LAFAYETTE IN DEPT OF STATISTICS,...

This work examines the three-dimensional dynamic response of a nonlinear fast reactor with temperature-dependent feedback and delayed neutrons when subjected to uniform and local disturbances. The finite element method was employed to reduce the partial differential reactor equation to a system of ordinary differential equations which can be numerically integrated. A program for the numerical solution of large sparse systems of stiff differential equations developed by Franke and based on...

Topics: DTIC Archive, Bermudes,Eulogio Conception, NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF, *REACTOR...